On my 2003, I ran them at 32 as I found it the best compromise between ride, handling, and tire life.
I sold the vehicle at close to 70,000 km, on the original tires, and there was lots of life left on them. Never rotated them, and they were worn very evenly.
I think 38 is much too high, you will wear the centre of the tread.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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